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Cochlostoma Septemspirale Septemspirale (Razoumowsky, 1789) Dans Le Val-D’Oise : Première Mention De L’Espèce Pour L’Île-De-France (Gastropoda, Cochlostomatidae)

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Cochlostoma Septemspirale Septemspirale (Razoumowsky, 1789) Dans Le Val-D’Oise : Première Mention De L’Espèce Pour L’Île-De-France (Gastropoda, Cochlostomatidae) MalaCo (2016) vol. 12 : 5 Découverte d’une station de Cochlostome commun Cochlostoma septemspirale septemspirale (Razoumowsky, 1789) dans le Val-d’Oise : première mention de l’espèce pour l’Île-de-France (Gastropoda, Cochlostomatidae) Pierre Tillier, 8, rue d’Aire, F-95660 Champagne-sur-Oise, [email protected] Julien Bottinelli, 879 D, rue du Château, F-77120 Mouroux, [email protected] Reçu le 25 avril 2016, accepté le 06 juin 2016 Cochlostoma septemspirale septemspirale (Razoumowsky, 1789) est population valdoisienne de C. s. septemspirale est-elle relictuelle, une espèce sud-européenne (Kerney & Cameron 1999), dont la répartition témoignant d’une répartition passée plus vaste ? Cette découverte montre actuelle est limitée, en France, au sud et à l’est. D’anciennes publications, surtout que les connaissances malacologiques de ce secteur de l’Île-de- antérieures à 1850, signalent sa présence dans les départements du Pas-de- France sont encore bien parcellaires. De futures prospections dans des Calais (Bouchard-Chantereaux 1838) et de l’Oise (vallée de l’Epte, de la stations favorables de la région (stations calcaires avec affleurements Troëne et de la Trie) (Baudon 1884), mais aucune donnée postérieure n’est rocheux) permettront peut-être d'établir un lien entre cette population isolée connue et des recherches récentes n’ont pas permis de retrouver l’espèce et celles des régions voisines, plus à l’est. (Cucherat & Demuynck 2006). Quelques stations étant connues de l’Aube, de la Marne et de l’Yonne (données INPN : Muséum national d’Histoire naturelle [Ed], 2003-2015), sa présence en Île-de-France était supposée possible, notamment dans le sud de la région. Le 12 avril 2016, plusieurs dizaines d’individus de C. s. septemspirale ont été observés à la base de différents affleurements calcaires d’une pelouse calcicole (Figures 1 et 2) de la forêt départementale de la Tour du Lay, sur la commune de Parmain (Val-d’Oise), espace naturel géré par le Conseil Départemental du Val-d’Oise. Figure 3 : Carte de répartition actualisée de C. s. septemspirale en France (carte INPN, modifiée). Remerciements - Nous tenons à remercier Xavier Cucherat pour les précisions communiquées quant à la répartition de l’espèce. Bibliographie Baudon, A. 1884. Troisième catalogue des mollusques vivants du département de l'Oise. Journal de Conchyliologie, 32 (3) : 193-325. Figure 1 : C. s. septemspirale (Razoumowsky, 1789), photographiés sur le site de découverte de l’espèce dans le Val-d’Oise. Bouchard-Chantereaux, N. R. 1838. Catalogue des Mollusques terrestres et fluviatiles observés jusqu’à ce jour à l’état vivant dans le département du Pas-de-Calais. Mémoire de la Société d’Agriculture, des Sciences et des Arts de Boulogne-sur- Mer, 1 (2) : 141-280. Cucherat, X. & Demuynck, S. 2006. Catalogue annoté des Gastéropodes terrestres (Mollusca, Gastropoda) de la région Nord-Pas-de-Calais. MalaCo, 2 : 40-91. Kerney, M. P. & Cameron, R. A. D. 1999. Guide des escargots et limaces d’Europe. Identification et biologie de plus de 300 espèces. Adaptation française par A. Bertrand. Les guides du Naturaliste. Delachaux & Niestlé, Lausanne et Paris. 370 pp. Muséum national d’Histoire naturelle [Ed]. 2003-2015. Inventaire National du Patrimoine Naturel, site Web : http://inpn.mnhn.fr. Le 16 septembre 2015 Les auteurs : Pierre Tillier est professeur agrégé de Sciences de la Vie et de la Terre et entomologiste. Julien Bottinellli est professeur agrégé de Sciences de la Vie et de la Terre et Figure 2 : Habitat de C. s. septemspirale dans la station valdoisienne. Les individus se trouvaient naturaliste pluridisciplinaire. au pied des affleurements calcaires. La découverte de cette station dans le nord du Val-d’Oise constitue ainsi la première mention de cette espèce pour l’Île-de-France. Elle étire de plus de 150 km vers le nord-ouest la limite occidentale de répartition actuellement connue du gastéropode pour la moitié nord de la France (Figure 3). Cette © 2016 Journal MalaCo (ISSN 1778-3941), http://www.journal-malaco.fr 5 .
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